Tire mounting rim



Sept. 9, 1947. H. T. KRAFT TIRE MOUNTING 'RIM Original Filed June 9, 1942 INV ENT OR. Herman T. K raft ATTORN Y5 Patented Sept. 9, 1947 UNITED STATES PATENT OFFICE 'i fitil MOIF NT'I N G Herman T. Kraft; Akron, Ohio, assigno'r to' The General Tire & Rubber Gompany, AkromOhio; acorporation of Ohio V ji i ginal appliaitiiifi- Jiin 9'} i912; s'enai' 1%: 446g356. Divided and this application January 20, 1 944, senarNo. 518,927

3 Claims. 1

This invention relates to a mounting rim for pneumatic tires and more particularly to a tire mounting rim for use upon airplane landing wheels, the present application being a division of copending application Serial No. 446,356, filed June 9, 1942.

Because of the excessive forces of impact to which tires of an airplane landing wheel are subjected in service, it is desirable that the beads of the tire be very firmly anchored against circumferential slippage on the rim.

It is the object of the present invention to provide a simple and practical means for firmly anchoring a pneumatic tire to its supporting rim.

With the above and other objects in view the invention may be said to comprise the device as illustrated in the accompanying drawings hereinafter described and particularly set forth in the appended claims together with such variations and modifications thereof as will be apparout to one skilled in the art to which the inven tion pertains.

Reference should be had to the accompanying drawings forming part of the specification in which:

Fig. 1 is a fragmentary side elevation of a wheel embodying the invention;

Fig. 2 is a fragmentary section on an enlarged scale taken on the line indicated at .22 in Fig. 1; and

Fig. 3 is a sectional elevation showing a portion of the tire and rim in transverse section.

Referring to the accompanying drawings the device of the present invention is shown applied to a suitable wheel l having tire supporting rim 2 that is provided with tire retaining flanges 3 at opposite sides thereof. The rim 2 provides an annular tire supporting base and is formed to provide inwardly tapering bead seats 4, one adjacent to each of the flanges 3. To resist slippage of the tire the external surfaces of the tapering portions 4 of the rim are provided with transverse serrations -5.

A tire ii is mounted on the rim and has heads I that are internally engaged by the tapered serrated seats 4. The tapering portions 4 of the rim are each provided with circumferentially spaced threaded openings 8 that are adapted to receive tire fastening screws I0. Each of the screws I is provided adjacent its head with a portion ll of uniform diameter that is threaded to screw into an opening 8. Each screw has a tapered point 12 that is adapted to pass through the opening *8 and which is provided with a thread so that it may be screwed into the tire bead 1.

The thread of the tapered point [2 preferably terminates short of the threaded portion l I, leaving a short unthreadedspace l3 between the threaded portions LI and I2.

The portions l2 and I3 of the screw are of less diameter than the opening 8 so that the screw can be inserted into the opening 8 to engage the point thereof with the interior surface of the bead 1 whereupon the screw may be turned to advance the point 12 into the bead I and to screw the threaded portion I I thereof into the threaded opening '8 of the rim. The pitch of the thread on the tapered portion of the screw that engages the tire bead is greater than the pitch of the thread on the portion II that screws into the rim opening so that the screw exerts a radial inward thrust on the tire bead drawing the same against the serrated surface of the seat 4 as the screw is advanced into the bead.

A Washer M may be imposed between the hea of each screw and the inner surface of the rim 2 to prevent the screws from working loose. The screws l0 may be driven into the beads after the tire has been mounted on the rim and pressed tightly against the flanges 3 and seats 4 by internal air pressure. The screws l0 serve to firmly fasten the tire beads to the serrated seats and to securely hold the tire against circumferential slippage on the rim.

It is to be understood that variations and modifications of the specific device herein shown and described for purposes of illustration, may be made without departing from the spirit of the invention.

What I claim is:

1. A the mounting rim having annular bead seating portions that are provided with threaded openings, and bead fastener screws, each having a tapered threaded bead engaging point adapted to screw into a tire bead and a portion of uniform diameter having a thread of less pitch than the thread on the tapered point and adapted to be screwed into a rim opening, whereby each screw may be simultaneously screwed into the rim and tire bead to draw the bead inwardly against its seat.

2. A tire mounting rim having annular externally serrated bead seating portions that have threaded openings, and bead fastener screws, each having a tapered threaded bead engaging point of smaller diameter than said openings and a portion of uniform diameter threaded to screw into one of said openings, the pitch of the thread on the tapered point being greater than that of the thread on the portion of uniform diameter, whereby the screws are adapted to draw the beads inwardly against said serrated seats.

3. A tire mounting rim having an annular base having tire retaining flanges at opposite sides thereof and inwardly tapering; bead seatingportions immediately adjacent each flange, said head seating portions having transverse serrations and each having circumferentially spaced threaded openings, and bead fastener screws each having 10 a head, a threaded portion adjacent the head adapted to screw into a rim opening and a tapered bead engaging point adapted. to pass through the rim opening and provided with a thread of greater pitch than the rim engaging thread.

HERMAN T. KRAFT.

4 REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

